keepalived + LVS DR 構建高可用負載均衡

本文參考博客: https://blog.csdn.net/Ki8Qzvka6Gz4n450m/article/details/79119665
原博客很詳細並正確，重新記錄只爲方便查找和搭建

一、環境簡述
real server1: 192.168.50.207 -----------httpd服務器
real server2: 192.168.50.235 -----------httpd服務器
director server1:192.168.50.232--------lvs dr服務器+ keepalived服務器
director server2:192.168.50.231 -----lvs dr服務器+ keepalived服務器
測試服務器: 192.168.50.208

二、搭建
1 real server1和real server2服務器設置:
分別執行以下腳本
[root@localhost lvs_dir]#cat lvs_dr_rs.sh
#!/bin/bash
vip=192.168.50.252
ifconfig lo:0 $vip broadcast $vip netmask 255.255.255.255 up
route add -host $vip lo:0
echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
注: httpd的安裝和設置省略，參考前面的博客

2. director server1服務器設置:
   [root@localhost keepalived]# cat /etc/keepalived/keepalived.conf
   ! Configuration File for keepalived

global_defs {
notification_email {br/>[email protected]
}
notification_email_from keepalived@232
smtp_server 192.168.50.232
smtp_connect_timeout 30
router_id 232
! vrrp_skip_check_adv_addr
! vrrp_strict
! vrrp_garp_interval 0
! vrrp_gna_interval 0
}

vrrp_instance VI_1 {
state MASTER
interface ens160
virtual_router_id 111
priority 100
advert_int 1
authentication {
auth_type PASS
auth_pass 1111
}
virtual_ipaddress {
192.168.50.252
}
}

virtual_server 192.168.50.252 80 {
delay_loop 6
lb_algo rr
lb_kind DR
persistence_timeout 0
protocol TCP

real_server 192.168.50.235 80 {
    weight 1
    TCP_CHECK {
        connect_timeout 10
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
    }
}

real_server 192.168.50.207 80 {
    weight 1
    TCP_CHECK {
        connect_timeout 10
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
    }
}

}

[root@localhost keepalived]# echo 1 > /proc/sys/net/ipv4/ip_forward

3. director server2的搭建類似
   只需要將keepalived的配置文件中的內容稍作修改
   state MASTER -> state BACKUP
   priority 100 -> priority 90

4. 啓動keepalved服務（director server1和director server2）
   [root@localhost keepalived]# systemctl start keepalived

三、測試
1 測試負載均衡(208上):
[root@localhost ~]# curl 192.168.50.252:80
235
[root@localhost ~]# curl 192.168.50.252:80
207
[root@localhost ~]# curl 192.168.50.252:80
235
[root@localhost ~]# curl 192.168.50.252:80
207
2.測試real server的單點故障問題:
關掉235上的httpd服務，然後在208上測試:
[root@localhost ~]# curl 192.168.50.252:80
207
[root@localhost ~]# curl 192.168.50.252:80
207
3.測試director的高可用性
關掉231服務器的keepalived，或者關掉網卡等，再在208上測試
[root@localhost ~]# curl 192.168.50.252:80
235
[root@localhost ~]# curl 192.168.50.252:80
207
[root@localhost ~]# curl 192.168.50.252:80
235
[root@localhost ~]# curl 192.168.50.252:80
207